Automatic measuring device for bulk material



May 3l, 1949. P. F. ovERMYER AUTOMATIC MEASURING DEVICE FOR BULK MATERIAL Filed May 21, 1945 n 4 sheets-sheet 1` IN VEN TORI Pff/@Y E UM May 31, 1949- P. F. ovERMYEr-zl 2,471,494

AUTOMATIC MEASURING DEVICE FOR BULK MATERIAL Filed May 21, 1945 4 .'iJheecs-Sheefl 2 FISE;

/04 l/af Q@ maa/@m4 g1 P. F. OVERMYER AUTOMATIC MEASURING DEVICE FOR BULK MATERIAL May 3l, 1949.

Flec May 21, 1945 Vl. mw M m ,m mM 7 NE ,n D 05. A E ,Vr E F. w mw Za f Mw P. F. OVERMYER AUTOMATIC MEASURING DEVICE FOR BULK MATERIAL May 31, 1949.

Filed May 21, 1945 4 Sheets-Sheet 4 INVENTOR: v PLF/@Py f- //fMy-.

Patented May 31, 1949 uNrrED STATI-:s PATENT OFFICE" AUTOMATIC FOR Perry F. O'vennyer, Chicagmlllr, as'sgfn'or` t'o Uni'- versal Atlas Cementy Company, a corporation of Indiana Application May 2r, 1945", S'eirJia'I-Iim. 5943979 5 Claims.

This invention relates tof apparatus for'm'eas'- uring bulk material' sucht as cement,- lime, or various other kinds of pulveriz'e'dl and dry building materials. The apparatus may alsoV4 be used'v in measuring-suchl materials-as grains, either ground er unground.

One or the objects ofi' thepresent invention" is to'provide automatic'Volumemeasuringl apparatus for'finely divided or'pulverul'ent material.

Another of' the obiectsl of the invention is to provide an' apparatusV of simple and rugged-construction andarrangement of parts-so that it-'will withstand considerable wear Without requiring unnecessary or flne adjustments to maintain it in satisfactoryV functioning operation.

Int the loadingoflarge" containers,I e. g., r'ail'- road cars, with pulverul'entmaterial such as cement, for shipment, it has? been: customary to deliver an' amount of material estimated to approximate'tnefdesired' load;- and thentol shift the car to-a-traclsscale for weighing; If theweight deviates more thanthe'- allowable amount from the desiredload, iti isI usually necessary to shift`-tlie car backto the-loadingstation and correct such deviation, involving' al loss oftime and'- increased cost.

The m'echanisinoff the present invention is-de; signed toovercome" such di'cultiesfby continu'-l ously measuringv the. volume of' pulverulentmate rial delivered tothe bulk container such as a car; the materialib'eing delivered under" such condi tions' that the A ratioA of! volume to Weight issub'- stantially a-v constant.A Thusthe" invention, by measurement ofi the-volume of pulverulent'` material loaded;` gives a measurement at allj tir'nes; Withincommercialv tolerances) of the" Weigl'itE4 of materiali loaded, thereby allowing the 'container tolbelledwith exactly a desired volume or weight ofmaterial-fwitliout theA necessity of` subsequent weighingy and load f correction;

One' selected 1 embodiment'- off theI mechanism of the! present i'r'ivention is shown in the' accompany; ing drawing-s` for purposes ofl illustration; but various changes or'- modifications maybe made tl'iereinwithouty departing from' the spirit and scope oithefinv'ention.

Figurefl is a diagrammaticviewin elevation of a packing machine or 'plantembod'ying theI pres# ent invention;

Figure 2 isa-'section takenon the 'iline'II-II o'f Figure/1;

Figur-e 311s agee-tion 'calientan lineifnI-nror Figureiz,

Figure 4 is'af' section taken-"onfilinefIVl-IV of ligureZ;vv

Figure 5 is a transverseA sectionitaken along line V`--V of Figure' 2;l

Figure 6`is a= section taken on line VI--VI- of Figures 2' and 7;

Figure '7 isa section taken along line'VII-VII of Figure 6;

Figure 8 is an enlarged fragmentary vi'ew'offth means for filling and dumping thel pluralitylo volumemeasuring containers shown generally in Figure 11;- A A Figure 9" is` a; s'ectiontak'en online IX-I'X'of Figure" 1; v

Figure 1'0` is a section taken Online X-'X- of Figure 9'; l 1 l l y Figure 11 isas'ection taken on line XI-XI of Figure 9; I

Figure 12 is a fragmentary's'ection taken online of Figure 8; K y

Figure 13 i'sfa-lfragmentary view in sectiontaken along-v the une' xine-X111- of- Figure s;

Figure 14lis a -ragmentarysection taken along the line'XIVe-HVy of Figure' 13; and

Figure 15v is a schematic wiring diagram for the apparatus described.`

InFigure 1' there isshown a portion of a conlventional packing plant embodying the apparatus of the present iriventiom The packing plantl in' cludes'a helical conveyor Zat the bottom thereof, whicnmay in tili'nrec'eive the pulverulent mate'- rialffr'omoneor more-conveyors l spacedalong conveyor 2'. Tliree'such' delivery conveyors l are showriof th'ehelicaltype. l

Tli'e-hel'ic'al @conveyor 2v delivers the lmaterial Ltc an elevator 31; wherein the material i's` carried-by alsuitablefmeansl totli'ge'topof theplant. The elevator discharges-1into'v one end of the helical cnveyorfbon 4; wherein the material is'ca'rr'ied along b'yhelics'il conveyor'screw 5 to the gates (iiof` tliexh'o'ppers l; At the lower vend of the'hoppersjl", packing statioris are suitablyjarranged and dis-V pos'edfto'pa'okage the materialdelvred vfrom the various hoppe'rsfl; So much of the plant as'has b'ee'nthus farl described may" be considered to b conventional, but the showing serves to make clear the" arrangement" and disposition o'f the mechanisn'ihereinafter lto 'be more fully consid ered andfconstituting the subject' matter of the presen-t invention.y

Such mechanism is employed in the' plant shown in vorderltoAv provide a'check'and record of the amount or quantity'of material that'is delivi ered to and passing 'through one y'of the hoppers', such as the one designated as 9 in Figure 1. VThe apparatu's'fof the-present inventionis shown; in general-- arrangementfwithiregard to othermechi anism of the plant in Figure 1, and in greater detail in Figures 2 to 15, inclusive.

Hopper 9, wherein the volume measuring apparatus is located, is fed with pulverulent material from conveyor 4 through spout I0. Excess material which has not been delivered to hoppers I or to hopper 9 through spout I0, is by-passed from the end of conveyor 4 through pipe II to conveyor 2 for recirculation. After being measured by the measuring apparatus in hopper 9, the pulverulent material is dumped therefrom into the left hand side of the bottom of hopper 9 (Figure 2), which is separated from the right hand side thereof by transverse partition I2 (see Figure 2). The right hand side of the bottom of hopper' 9 receives material unavoidably spilled or scraped off during rotation of the measuring containers from their filling to their emptying position. The material falling into the right hand side of hopper 9 is likewise returned to conveyor 2 for recirculation, in this instance by pipe I3.

The measured pulverulent material is delivered from the left hand side of the bottom of hopper 9 by means of screw conveyor I4 contained in conveyor housing I5, to the car filling pipe I6 for filling car II either from the side or from the top, as shown.

The automatic measuring device for the pulverulent material is shown in general in Figure 1 and in more detail, as to certain parts thereof, in Figures 2, 3, 4, 5, and 8. In the device shown, a table or a support I8 is formed by vertical plates I9 positioned at right angles to each other (see Figures 4 and 8) and welded to hub 28, which is secured to vertical shaft 22 by set screws 24. Shaft 22 is located for rotation coaxially of the upper portion 26 of hopper 9.

Shaft 22, which is indexed periodically, is supported for rotation on a stud, which projects up into the lower end of hub 20, as shown in Figure 8. The stud, which takes the weight of the shaft 22, the table, and the other equipment carried thereby, is supported on cross beams 30, which extend across the top of the lower funnel shaped portion of hopper 9. The upper end of shaft 22 is carried by bearing 32, supported as shown in Figure 13 by the upper frame of the hopper 9.

' Secured to the top of the plates I 9, as by welding, are an outer rim of circular angle iron 34, and an intermediate annular plate 36, and secured to the top of the hub 28 by screws is an inner annular member 38. Carried upon the table I8 and spaced equally therearound are four measuring containers 40 (see Figure 3), which are sequentially filled from spout I0, which projects through cover 52 of hopper 9.

Means, subsequently to be described, index shaft 22 to bring an empty container 40 under spout II) and hold it in such position until that container is lled. When the container is filled, the rotatable table is automatically advanced to bring another empty container under the filling spout I0, and to stop it in such position, whereupon the previously filled container is emptied in the left hand side of hopper 9. Electric switch means, presently to be described, operates ea-ch time the container carrying table is indexed, and in turn operates, through a circuit 44 the counter or calculating meter 46, shown in Figure 1, thereby giving a continuous indication of the number of containers which have been dumped into hopper 9 during the particular loadin-g operation.

The cylindrical side portions of each of the measuring containers 40 are supported on the rotatable table as by Welding the bottoms of the lower flared portions 48 of the containers 40 to members 34 and 38, as shown in Figure 8. Top frame plate 58, which is rigidly attached to the tops of the measuring containers, has holes therethrough of the same size as the interior of the containers thereby allowing the passage of the powdered material from spout I0 into such containers. Spout I8 extends down through cover plate 52 of hopper 9 and terminates at a hole in plate 54 at the filling station (Figure 8), such plate extending across the top of the hopper, as shown in Figure 3. Around the hole in plate 54, on the bottom part of such plate, there is provided a wearing plate 56 which lightly rubs top frame plate 58 to make a seal between spout I8 and the particular container being filled.

Each of the measuring containers is closed at the bottom by means of a valve member 58 in the shape of a cone with an included angle such that the elements of the cone are in-clined to the horizontal at an angle greater than the angle of repose of the material being measured. Valves 58 are held in their upper, container closing, position at all times, against the gasket 'I8 affixed to the inside of the flared portion 48 of each container (see Figure 14) except when over the left hand side of hopper 9 (Figure 2), where the containers dump, by means 0f the interrupted circular track 8U (see Figure 5) supported in fixed relationship with hopper 9 by means of cross members 38. Running on track 68 and thus holding valves 58 in closed position are casters 52, each of which is secured by screw 64 to piston-like member 66 which is slidable in the lower end of sleeve 68 affixed to the member 36 of the table. The outer end of guide screw 64 extends through a vertical slot in rsleeve 68, the bottom end of member 66 contacting member 'I8 to form a stop for the travel of member 66. The upper end of sleeve 88 has a coaxial hole therethrough admitting plunger rod 12, to which valve 58 is attached. The inner end of rod I2 is provided with an enlarged head 'I4 between which and member 86, coil spring I6 is positioned in sleeve 68. Thus valve 58 is held in its upper closed position when caster 62 rides on track 50 in all but the dumping position, at which position the track is interrupted, and insures a tight seal between the valve 58 and the gasket 'I8 at the lower flared edge of the container. The placing of the sealing gasket at the lower flared edge of the container is advantageous because it is out of the direct path of flow of the material when the conical valve is lowered, and thus receives but little Wear. At the dumping position, track 60 is interrupted (see Figure 5) thus allowing casters 52 to drop a sufiicient amount when in that position to open valve 58. When the filled container is carried by the table I8, during indexing of the latter, to the point Where the caster 62 of its valve runs off the abrupt end 6I of track 60, the valve is dropped quickly and stopped with a jar, thus insuring dislodgement of all material in the container and on the valve. After leaving the dumping station, upon further indexing of table I 8, the containers are closed by the riding of casters 82 up on to the sloping end 62' of track 6I).

In Figure 8 there is shown the vupper portion of a container 48 located under spout I8 in position for filling. Pulverulent material from conveyor 4' flows into the container through the spout Il) past a rotating paddle or vaned wheel Sli-mounted on shaft y82 (see Figure 12). The paddle Wheel is located in the spout so that the greater part of it lies under overhang 84, and thus doesv not impede the ow of material to any great extent. When, however, the container becomes lled and the pulverulent material backs up and becomes compacted in spout I to a substantial extent, the paddle wheel, which is frictionally driven, becomes jammed by the material and ceases to rotate, thereby initiating in a manner to be described, an indexing movement of the container carrying table to bring an empty container under the filling spout, and to cause dumping of the previously filled container.

Shaft 82 carrying the paddle wheel is driven by continuously rotating motor 86 located on support 88 through speed reducing means 98 and shaft 92. Interposed between shafts 82 and 92 is an adjustable frictional driving means contained within housing 94 whereby the torque with which paddle wheel 38 is driven may be manually adjusted. The value of the driving torque selected depends upon the character of the pulverulent material and the degree of compaction of the pulverulent material in spout Ill which it is desired will cause initiation of the aforesaid indexing movement of the container carrying table. The adjustable frictional driving means for the paddle wheel is more fully shown in Figures 9, 10, and 11. As shown, shaft 92 projects through stationary bearing members 96 and into the right hand, cup-shaped end of shaft 98. Slots |58 in said cup-shaped end cooperatel with pin |02 on shaft 92, whereby shaft 98 may slide relative to shaft 92 while being rotated thereby. Shaft 98 has positioned thereon a transverse flange |04 cooperating with rollers |86 carried by arm |08 on slide II. Such slide is reciprocable in ways formed by angular members 2 attached to housing 94, and is held in predetermined adjusted V'position by means of screw 4 threaded into nut I I6 on the housing 94. The forward end of screw I |4 projects through a hole in the depending end of slide IIB, as shown, and is held therein by collars ||8 on the screw on opposite sides of said depending end.

Shaft 98 is carried, in its central portion, in bearing |28 in which it may slide longitudinally. The forward end of shaft 98 is provided with a counterbore in which is located coil spring |22 bearing upon an enlarged head of a stud |24. The forward end of stud |24 abuts against the central portion of friction disk |26, fixed to the inner end of shaft 82. rIhus spring |22 thrusts shaft 98 to the right and maintains plate |84 on shaft 98 constantly in contact with the positioning rollers |06. Attached to the forward counterbored end of shaft 98 is a circular plate |28, upon which are xed rearwardly directed cylindrical shells |30, each of which contains a compression spring |32. Studs |34, and friction plate |36 to which they are attached, are thus urged toward the friction plate |26 by springs |32 acting upon the inner enlarged spring engaging heads of the studs. Such heads engage plate |28 when the friction plates are completely separated from each other. By means vof the structure shown in Figures 9, and 11, the amount of torque imposed upon shaft 82 may readily be varied depending upon the extent to which shaft 98 is advanced to the left, in Figure 9, after friction plates |26 and |36 have been engaged by a suitable adjustment of screw II4. Therefore, paddle wheel 88 may be driven so that it is stopped by only a slight retarding force, which condition would be suitable when very light impalpable powders are being measured, up to an almost positive drive` of the paddle, which might-be necessary when relatively coarse, hard materials-are being measured.

As has been indicated, indexingr of the measuring containers is initiated when rotation of the paddle wheel is stopped by the packing of material thereabout. The initiation of such indexing is accomplished by a mechanism such as shown in Figures 6 and 7. Shaft 82, upon which Apaddle wheel 80 is mounted, runs through housing |38 containing an automatic switch mechanism. Within housing |38 the shaft 82 is supported for rotation by bearings supported by standards |48 and |42. Secured upon shaft 82 by the pin |44 for rotation with the shaft is a circular drum |46 made of cured molded synthetic resin or similar strong insulating material. Drum |46 as shown in Figures 6 and '7,'is closed at the left-hand.r end in Figure 7 and open at the right-hand end. The drum carries with-fin it a centrifugal switch mechanism, shown at the left in Figure 6, the drum being provided with a thickened portion, diametrically opposite it to insure its dynamic balance. Secured to the inner circumference of the drum is the support |49 for the movable contact arm, such support carrying inwardly directed spaced upstanding ears |5| pivotally mounting the movable contact member |58, which., 4as shown, is of generally L shape. One arm |5| of such generally L. shaped member |50 is provided with a shoulder and an outer threaded end so that a series of disk shaped weights |52 may be retained thereon by nut |53. It will be apparent that upon rotation of the drum the support |49 and the arm |50 travel with it and that the weight carrying arm |5I is impelled in a direction outward of the axis of rotation of the drum by centrifugal force.

The other arm |54 of the movable contact carrying member |50 is provided with a contact |55 near its outer end, such contact cooperating with the fixed contact IGI carried upon support |59, likewise secured to the inner periphery of the drum. Coil spring |56, positioned between the support |49 Aand the arm |54, maintains the contacts |55 and |6| together in current-carrying relationship when the drum is at rest, the spring being overpowered and the contact opened, however, by centrifugal force when the drum rotates at an appreciable speed. Movement of arm |5I outwardly upon rotation of the drum is limited by stop |51. Imbedded in the flange of drum |46 are conducting slip rings |41 and |48 concentric with the shaft 82. The contacts |55 and |'6|, respectively, are connected to rings |41 and |48 by 'flexible wires as shown in Figure 6. Connection of the slip rings in the operating circuit shown in Figure 15 is effected by means of the brushes |63 and |65 which are supported by, but insulated from, the support |42. It will be apparent that the centrifugal switch above described maintains the circuit energizing coil R of the relay open when paddle Wheel 80, and thus drum |46, is rotating, and closes the circuit therethrough when the paddle wheel and the drum |46 are brought substantially to rest.

For indexing the measuring container carrying table I8 there is provided a constantly running motor |58 which drives a speed reducing mechanism |6|l through a clutch and brake mechanism |62 operated by solenoid |64 (see Figure 2). The clutch and brake mechanism |62 is of a Well-known type wherein energization of solenoid |64 releases the spring operated brake and engages the clutch, and deenergization of solenoid |64 allows the spring to apply the brake anddisengage the clutch. A pulley |66 on the driven shaft of the speed reducer drives vertical shaft 22 through the medium of pulley |68, aflixed to the latter, and through belts |18 running over such pulleys.

Keyed to Vertical shaft 22 below the upper bearing 32 is an indexing disk |12 having four notches |14 spaced equally about the -circumference thereof in the proper position so that when indexing plunger |16 is engaged in any one of the notches |14, one of the measuring containers 4U is at the dumping station and another is at the lling station. (Figures 13 and 15.) Plunger |18 is supported for reciprocating movement toward and away from disk |12 in bracket |18. The plunger is normally held in the forward position in engagement with the disk by compression coil spring |82 positioned therearound and acting between the wall of hopper 9, through which the plunger passes and a collar |11 adjustably secured on the plunger by a set screw |11. Plunger |15` may be retracted from engagement with the indexing disk by energizing solenoid 86, which has within it a solenoid plunger which is a prolongation of plunger |16. In its retracted position the forward end of the plunger |16 is pulled well out from the notches |14 to allow rotation of shaft 22. Also carried by plunger |16 are two insulated switch arms |92 and |94, Whosefunction will be explained in -connection with the wiring diagram in Figure 15.

As shown in that figure, the power for operating constantly running motors 86 and w8 is supplied through leads |96 and |98', respectively, which are attached to the power source L1 and L2. Solenoid |64 is likewise supplied by the same source through leads as shown and through contacts C-C, which are closed upon energization of relay R. Such relay is energized from a control source L3 and L4, through closing of the switch in switch housing |38, which as has been described, occurs upon stopping of the paddle wheel 88.

Indexing plunger operating solenoid |85 is supplied with current from source Li-Lz through leads 282 and 284 and contacts C-C, such latter contacts likewise being closed upon energization of relay R. One lead |88 to solenoid |86 is connected to line 282, whereas the other lead |90 is connected to line 28d through normally closed thermally opened switch 286, and thus solenoid |86 is energized and the indexing plunger |16 is retracted upon stoppage of paddle Wheel 88 to allow indexing of table I8 In order to make the plunger |18 again operative to stop table I8 accurately at its next position, thermally operated switch 28e functions to break the circuit to soleinoid |36 after such switch has been subjected to heat by heating coil 288 for a selected period of time. initiation of the heating of heating element; 288 for the thermally operated switch 288 is accomplished when switch arm |92 makes contact with switch contacts 218 and 2|2, which occurs when the indexing plunger is retracted. In this instance, the time that it takes switch 268 to break the circuit is chosen such that the plunger |16 is retracted from a notch |14 and is shortly thereafter released after the notch has passed by it so that it is again pressed forward by the spring |82 and so that the forward end of the plunger rides on the periphery of the indexing disk in a position between the notch which it formerly occupied and the next notch on the disk. When such next notch thus arrives opposite the plunger, and the end of the plunger falls into the notch, shaft 22 and table I8 carried thereby are stopped. The cooling .characteristics of heating element 288 and the lag in closing of the switch 286 are made such that the switch 286 and consequently the circuit to the plunger operating solenoid |86 is not again closed before the opening of contacts C-C by relay R upon the resumption of rotation paddle wheel 88, which occurs when an empty container 58 is presented at the lling station and paddle wheel 88 is again freed.

Each time the plunger |16 is retracted7 switch arm |94 bridges contacts 2|4 and 2|6, thus also completing the circuit through wires All to the calculating meter 46. Accordingly, the meter registers each time the indexingplunger has been retracted, which is the same as the number of containers 48 which have been dumped.

The device described provides a means whereby the volume of material loaded into a container, such as car l1, is continuously measured. Because the pulverulent material is handled uniformly throughout the measuring operation, that is, stoppage of the paddle wheel in each case 0ccurs when each container has been iilled and packed to a uniform degree, the measured volume of material bears a substantially constant relationship to the weight of material dispensed, and thus the device of the present invention gives an accurate measurement of weight, as well as of volume, within commercial tolerances.

Calculating meter 46 may thus be calibrated, for a given adjustment of friction drive means 94 and with a given material, to give a reading of total weight of material dispensed as Well as a reading of total volume of such material. It should be pointed out that paddle wheel 38 should be placed high enough above the measuring container to allow substantially uniform packing of the material under the paddle wheel, as well as elsewhere in the spout. on the other hand, the volume of spout I8, including that under offset 8d, should be considerably less than the volume of each measuring container, in order that sufficient time may elapse after placement of an empty container under the spout to allow dumping to take place completely from the previously lled container.

Whereas a particular embodiment of the mechanism has been described, it is to be understood that the subject matter of the present invention is capable of numerous variations obvious to one skilled in the art, and that its scope is deiined by the accompanying claims.

I claim:

1. Apparatus for handling pulverulent material in bulk and measuring the same by volume, comprising a conveyor for delivering the material, a lling spout connected to the conveyor, and material measuring means fed by the spout, said measuring means comprising a plurality of measuring containers mounted for alternate indexing movement into juxtaposition with the iilling spout at a filling station and into a dumping station in position to be dumped, means for indexing the measuring containers, a paddle wheel located in the feeding spout, means for rotating the paddle wheel, and a control switch rotating with the paddle wheel and effective on stoppage thereof to initiate operation of the container indexing means.

2. Apparatus for handling pulverulent material in bulk and measuring the same by volume, comprising a conveyor for delivering the material, a lling spout connected to the conveyor for delivering the material, and material measuring means fed by the spout comprising a table, a plurality of open topped measuring containers mounted on said table, said table being mounted for movement about a central axis to bring the containers successively under the spout, means between the spout and the container in juxtaposition therewith making a close t therebetween, means on the table cooperating with each container` to close the bottom thereof at the filling station and to open it at a dumping station angularly displaced from the lling station, means for indexing the table about its axis to carry a lled measuring container away from the filling station and an empty container into the filling station, a paddle wheel located in the feeding spout at least partially in the path of material fed therethrough, means for rotating the paddle wheel, and means responsive to stoppage of the rotation of the paddle wheel by packing of the material thereabout to initiate operation of said indexing means.

3. In the apparatus set out in claim 2, the means for rotating the paddle wheel being a constantly rotating motor, and a slip clutch located between such motor and the paddle wheel, the means responsive to stoppage of the rotation of the paddle wheel being an electric switch member so connected to the paddle wheel that is initiates operation of the indexing means when the paddle wheel is stopped.

4. The apparatus set out in claim 2, including a bypass delivery duct arranged to receive material from said conveyor at a point beyond the point at which the spout is connected, whereby material being delivered Iby said conveyor to said spout is prevented from unduly packing and accumulating at the spout during intervals in which the fio-w of material through the spout is stopped during indexing of the containers.

5. Apparatus for handling pulverulent material in bulk and measuring the same by volume, comprising a conveyor for delivering the material, a lling spout connected to the conveyor for delivering the material, and material measuring 10 means fed by the spout comprising a plurality of measuring containers mounted for movement a1- ternately into a lling station wherein a container is placed in substantially pulverulent material tight relationship with the spout, and a dumping station, the spout having an overhanging portion to provide a space therein substantially out of the line of ow of the material therethrough, a rotatable paddle Wheel so located in the spout that a major portion thereof lies under said overhanging portion of the spout, a yieldable driving means for said paddle wheel which allows stoppage thereof when the container in communcation with the spout is filled and the material packs about the paddle wheel in the spout, and means responsive to stoppage of the paddle wheel for indexing the measuring containers to bring an empty container into communication with the filling spout.

PERRY F. OVERMYER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 13,397 Postley Aug. 7, 1855 308,001 Sommer NOV. 11, 1884 349,971 Baird Sept. 28, 1886 377,417 Wiley Feb. 7, 1888 476,608 Calkins June 7, 1892 640,625 Braun Jan. 2, 1900 928,658 Hoyt July 20, 1909 1,037,794 Newton Sept. 3, 1912 1,082,354 Mulloy Dec. 23, 1913 1,274,977 Bird Aug. 6, 1918 1,938,669 Smith Dec. 12, 1933 2,042,627 Quinn June 2, 1936 2,320,767 Washburn et al. June 1, 1943 FOREIGN PATENTS Number Country Date 303,606 Italy Dec. 10, 1932 Certificate of Correction Patent No. 2,471,494. May 31, 1949.

PERRY F. OVERMYER It is hereby certified that errors appear in the printed specification of the above numbered patent requiring correction as follows:

Column 7, line 23, for screwr 177 read screw 177 column 9, line 29, for the Words that is read that it;

and that the said Letters Patent should be read With these corrections therein that the same may conform to the record of the case in the Patent Oflice.

Signed and sealed this 8th day of November, A. D. 1949.

THOMAS F. MURPHY,

Assistant Uommzssz'oner of Patents. 

